File Description:Medical Evacuation aircraft based in Barrow, Alaska, belonging to the North Slope Borough. North Slope Borough is a borough located largely in the North Slope region of the U.S. state of Alaska. As of the 2000 census, the population was 7,385. The borough seat is Barrow. The North Slope Borough is the largest county-level political subdivision in the United States by area, with a larger land area than that of the state of Utah. Flights taken from FlightAware for the week of August 17-23, 2014. Update of my Winter 2010-11 plans.